Don't create a MemoryBuffer just to get the MemoryBufferRef. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216608 91177308-0d34-0410-b5e6-96231b3b80d8
typo in comment


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216609 91177308-0d34-0410-b5e6-96231b3b80d8
Use local variable to improve readability. 

No functional change intended.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216611 91177308-0d34-0410-b5e6-96231b3b80d8
[FastISel] Fix a potential bug in FastEmitInst_ri

FastEmitInst_ri was constraining the first operand without checking if it is
a virtual register. Use constrainOperandRegClass as all the other
FastEmitInst_* functions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216613 91177308-0d34-0410-b5e6-96231b3b80d8
Group unsafe-math optimizations for fsub into one block. No functional change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216616 91177308-0d34-0410-b5e6-96231b3b80d8
[FastISel][AArch64] Use the zero register for stores.

Use the zero register directly when possible to avoid an unnecessary register
copy and a wasted register at -O0. This also uses integer stores to store a
positive floating-point zero. This saves us from materializing the positive zero
in a register and then storing it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216617 91177308-0d34-0410-b5e6-96231b3b80d8
Fix a double free in llvm::getBitcodeTargetTriple.

Unfortunately this is only used by ld64, so no testcase, but should fix the darwin LTO bootstrap.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216618 91177308-0d34-0410-b5e6-96231b3b80d8